Final answer:
The outbreak of a bacterial plague in Buffalo, New York is an example of a known unknown, as the specific details and cause of the outbreak are not yet known. This outbreak falls into the category of emerging infectious diseases, where new diseases or strains of known diseases are identified and studied.
Step-by-step explanation:
This outbreak of a bacterial plague that digests gasoline in Buffalo, New York can be considered a known unknown. While it is unexpected and unprecedented, the cause and specific details of the outbreak are not yet known. It falls into the category of an emerging infectious disease, where new diseases or strains of known diseases are identified and studied. The modern distribution of this disease is not mentioned in the provided information.